Ore-reducing furnace.



No. 890,229. PATENTED JUNE 9, 1908.

J. T. JONES.

`ORE` REDUOING PURNAGE. APPLIOATION FILED nmlzs. 1907.

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Urvirnn STAT-Es PATENT oFFroE.

`IOHN T. JONES, OI" `IRON MOUNTAIN, MICHIGAN, ASSIGNOR OF ONE-HALF TO GEORGE A. SI.

CLAIR, OF DULUTH, MINNESOTA.

ORE-REDUCING FURNACE.

No. 890,229.k

Specification of Letters Patent.

Patented June 9, 1908.

T o all whom it may concern:

Beit known that I, JOHN T. JONES, a citizen of the UnitedStates', residing at Iron Mountain, in the county of Dickinson and State of Michigan, have invented a new and useful Improvement in Ore-Reducing Furraces, of which the following is aspeciiication,

The object of my invention is to provide a construction of ore-reducing furnace whereby it. shall bc rendered practically indestructible under the intense heat to which it is subj ected when such highly refractory ores are treated in it as those for example producing the ferro-alloy.

The accompanying drawing illustrates my improved furnace by a view in vertical sectional elevation, with the upper portion of the stack broken away.

'lhe general construction of the illustrated furnace is the same as that shown and described in U. S. Patent No. 866,280 granted to me September 17, 1907, involving an orestack l rising to a height of a hundred feet, more or less, above a cooling-chamber 2 in its base-portion containing a conveyor 3 and a carbonaceous-fuel-burning furnace .4 communicating from about midway between its upper and lower ends with the stack near its' base through a neck-like flue 5 containing a species of central bridge-wall 6, having inclined sides to tend to prevent the escape of solid material from the stack into the furnace and from the furnace into the stack. The structure is, for the most part, formed 0f or lined with suitable refractory brick, preferably magnesite brick, but I form that portion which is subjected to the greatest intensity ofheat, particularly the neck 5, of carbonaccous material which is practically infusible in the atmosphere of thehot carbonic-oxid gases from the furnace to which it is subjected. By preference, I form of the same carbonf-ceous material the section 7 of which is the bosh .section or portion nearest the flue-neck, and also the portion S, nearest the latter, of the furnacewall to extend taperingly partway about the same, as indicated. In the front brickportion of the furnace, thus between the ends of the tapering section 8, is provided a twyer 9, projecting a short distance into the furnace-chamber coincidently with the flue 5, and surrounded in the furnace-wall by a tapenng sleeve 10 of heat-insulating material,

. by Letters such as magnesite, the sleeve being inclosed in a water-jacket 11 in contact with the brick of the wall and provided with the inletpipe 12 and outlet-pipe 13 for circulating the cooling-water through it.

The carbonaceous material employed for the parts 5, 7 and 8 may be solid blocks of graphite, or a mixture of pulve'rized graphite in the roportion of about ten per cent. and crushed coke in the proportion of about ninety per cent., with a suitable binder, as coal-tar, the mixture being compacted into solid form, as by hydraulic pressure, and then baked.

To operate the furnace the fuel-chamber is filled with suitable coal, which is ignited and raised by the air-blast through the port 14 to incandescence to the part of the fuel-bed adjacent to thcinlet-end of the flue, above which the hydrocarbons are distilled by the heat from the coal and drawn with the gases from the incandescent portion of the bed into and mixed with them in the flue, whence they discharge into lthe stack, passing upwardly through the latter and through the ore with which it is filled, to discharge from its upper end. The air forced thereafter through the fuel-bed by the twyer 9 should be preparatorily heated, `as by passing it through an ordinary checker-chamber heating-device, to raise it to a temperature of from two to three thousand degrees Fahrenheit. Th' of the twyer prevents this highly heated air from coming into direct contact with its metal walls and it projects sufficiently far into the fuel-chamber to prevent rebounding of the blast against the brick-wall portion of the furnace surrounding the twye'r.

In my mproved furnace, constructed as described with the proportions of carbonaceous material, I have used an intensity of hc at sufficient to melt out injury What I very refractory orcs, withto the structure.

Patent is` 1. An ore-furnace comprising an orc-stack, a carbonaceous-fuel-burning furnace, and a flue composed of solid carbonaccous material connecting the fuel-chamber with said stack, for the purpose set forth.

2. An ore-furnace comprising an orc-stack, a carbonaceous-fucl-burning furnace having a section of its wall composed of solid carbonaceous material, and a flue composed of e construction claim as new and desire to sccurc i 5 a carbonaceous-fuel-burning like material connecting said section of the 'furnace-wall with said stack, for the purposeset forth.

3. An ore-furnace comprisin en ore-stack,

connecting flue between them, the bash-sec-v tion of said stack, the Hue and the furnace# wall at the connection therewith of the flue beingcomposed of solid carbonaceous maten 10 rial, for the purpose set forth.

rnace; and e;

lser. section'of' its Well composed of solid carbonaceous material, a. ue of like material connecting said section of the furnace-wall .with saidstack, and a. Water-j acketed' heatinsulated twyer projecting into the furnacechamberthrou h and beyond the inner surface of the wel? thereof'at saidue, for the purpose set forth.

. JOHN T. JONES. 'In'presence of:

K. M. CORNWALL, R. A. SCHAEFER. 

